Function fixup_deref_opargs

crates/codegen/src/ir.rs:3124–3144

Convert DEREF instruction opargs from cell-relative indices to localsplus indices using the cellfixedoffsets mapping.

(blocks: &mut [Block], cellfixedoffsets: &[u32])

/// Convert DEREF instruction opargs from cell-relative indices to localsplus indices
/// using the cellfixedoffsets mapping.
pub(crate) fn fixup_deref_opargs(blocks: &mut [Block], cellfixedoffsets: &[u32]) {
    for block in blocks.iter_mut() {
        for info in &mut block.instructions {
            let Some(instr) = info.instr.real() else {
                continue;
            };
            let needs_fixup = matches!(
                instr,
                Instruction::LoadDeref { .. }
                    | Instruction::StoreDeref { .. }
                    | Instruction::DeleteDeref { .. }
                    | Instruction::LoadFromDictOrDeref { .. }
                    | Instruction::MakeCell { .. }
            );
            if needs_fixup {
                let cell_relative = u32::from(info.arg) as usize;
                info.arg = OpArg::new(cellfixedoffsets[cell_relative]);
            }
        }
    }
}